In most cases, ALT will be measured in units per liter (U/L) or international units per liter (IU/L)
Interpreting test results
The test report should have a line that shows both your ALT level as well as the reference range that the laboratory uses to categorize ALT levels as normal or abnormal.
When reviewing your results, keep in mind that there is no universal reference range for ALT. There can be variation in laboratory methods that affect what is considered normal. For this reason, it’s important to look at the range provided by the specific lab that analyzed your blood.